Hi,
I discovered later I can create sub-assemblies categories. And I has lot of sub-assemblies to move in custom categories. I didn't found a way to do it in game...
I spent more than one hour to search which file store categories names and category choice per sub-assembly. I discovered that everything is in one file at "KSP 1.6.1\GameData\Squad\PartList\SubassemblyCategories.cfg".
I submit to save this file into "KSP 1.6.1\saves\[save name]\Subassemblies".

Papajoe may change "KSP Max Version" defined for CKAN. Currently "1.3.0" parameter only support KSP 1.3.0 (or lower), but if Papajoe define "1.3" CKAN will understand his mod support any KSP 1.3.x versions.

I like build small crafts, and I use Linear RCS as main engine (Fore Throttle is nice for landing). My main problem is to estimate TWR.
I submit your (lovely) mod display TWR and "body" selector if we choose Translation mode with "fore" direction. Another way can be to add "RCS as Engines" mode which work like "Engines" mode.
NB: Thrust ASL can be usefull too.

Both parts use same texture. tankimgA1 and tankimgA2 are near identical (tankimgA1 have a mention not used for texturing parts).
My game never load texture for radial tank (and I didn' found error into the log). I hadn't this problem for inline tank.
I'm not mod dev, I don't known what going wrong...

Why you wish enlarge your rover whether the lighter one did same job ?
Ruuvnik, 225 kg and its so small landing stage requires ridiculous launcher less than 16 tons. Read more about my studies on Reddit.